Hi everyone,
I recently went through the interview process for a Senior Software Engineer - Frontend Developer role at ServiceNow, and wanted to share my experience.

Round 1 (DSA + Frontend Design)

• Brief introduction
• Interviewer explained his background

1. Merge Intervals - https://leetcode.com/problems/merge-intervals/
2. Copy Linked List with Random Pointer - https://leetcode.com/problems/copy-list-with-random-pointer/

Frontend System Design:

• Design a Nested Comments system

  • Focus on component structure
  • Data flow and recursion
  • Handling deeply nested threads

Verdict: ✅ Cleared

Round 2 (Frontend Coding)

• Build an Autocomplete Search Component

  • Debouncing
  • API handling
  • UX considerations (loading, empty state, etc.)

Verdict: ✅ Cleared

Round 3 (System Design + Deep Dive)

• 2 Interviewers
• Introduction + detailed discussion on past experience

System Design:

Design a Notification Panel for a Web App

Key areas they expected:

• Component structure (modular design)

• State management strategy

• Data fetching & API interaction

• Handling loading states, real-time updates, and data consistency

Detailed discussion on one of my recent projects

Performance Question

• Problem: Rendering 100k messages efficiently

Expected Solution:

• List Virtualization
• Support for dynamic heights
• Proper scroll management

Verdict: ✅ Cleared

Final Outcome

All rounds were successfully cleared.
However, the process did not proceed further as ServiceNow paused hiring for the engineering teams, and no further interviews were scheduled.